Numerical study of chemical reactions in a surface microdischarge tube with mist flow based on experiment

T. Shibata, H. Nishiyama

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

Abstract

Recently, a water treatment method of spraying solution into a discharge region has been developed and shows high energy efficiency. In this study, a simulation model of a water treatment method using a surface microdischarge (SMD) tube with mist flow is proposed for further understanding the detailed chemical reactions. Our model has three phases (plasma, gas and liquid) and three simulation steps. The carrier gas is humid air including 2% or 3% water vapour. The chemical species diffusion characteristics in the SMD tube and the concentrations in a droplet are clarified in a wide pH interval. The simulation results show that the chemical species generated on the SMD tube inner wall are diffused to the central axis and dissolved into fine droplets. Especially, OH radicals dissolve into droplets a few mm away from the SMD tube wall because of acidification of the droplets. Furthermore, the hydrogen peroxide density, which is the most important indicator of a radical reaction in water, is influenced by the initial solution pH. This pH dependence results from ozone self-decomposition in water.

Original languageEnglish
Article number105203
JournalJournal of Physics D: Applied Physics
Volume47
Issue number10
DOIs
Publication statusPublished - 2014 Mar 12

Keywords

  • mist flow
  • numerical simulation
  • plasma
  • water treatment

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Acoustics and Ultrasonics
  • Surfaces, Coatings and Films

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